This is not part of an Omega Logo. And you do not have a Prototype. i had 3 flightmasters over the last 30 years. all came back with excerpts from the factory. looks like your movement does not belong to this watch. reason? in the 1980`s many spareparts were sold in peru from the guys, who serviced them for the FAP. empty cases, spare (and not Flightmaster engraved) backs . dials. hands . so, that movement is easy to find and off you go, another Flightmaster is born. like the IWC MK 11 watch and spare parts government auctions in the UK. many MK 11 watches were "born" then. and because they had more parts watches than dials, an UK dealer had dials printed with a weird logo and a few in white. and then came the dealers "Legends" from the extremly rare white dial MK 11 for the Royal Navy.....google it and then you have one story from the strange world of government issued military watches and what happened after decommission and government auction sales. you have a nice put together. wear it for what it is and be happy. no mystery here. kind regards. achim